We experimentally demonstrate backward second-harmonic generation in periodically poled LiNbO3 with a 3.3- µm domain period. We observed higher-order phase matching near 1490, 1600, and 1700 nm (fundamental) for the 19th, 18th, and 17th orders, respectively, with a maximum conversion efficiency of 0.02%.
© 1997 Optical Society of America
Jin U. Kang, Yujie J. Ding, William K. Burns, and Joseph S. Melinger, "Backward second-harmonic generation in periodically poled bulk LiNbO3," Opt. Lett. 22, 862-864 (1997)